{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T15:00:05Z","timestamp":1791385205042,"version":"4.3.3"},"reference-count":44,"publisher":"American Chemical Society (ACS)","issue":"19","license":[{"start":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T00:00:00Z","timestamp":1790208000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100031478","name":"NextGenerationEU","doi-asserted-by":"publisher","award":["ID 2022X29985, CUP D53D23002930006"],"award-info":[{"award-number":["ID 2022X29985, CUP D53D23002930006"]}],"id":[{"id":"10.13039\/100031478","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100031478","name":"NextGenerationEU","doi-asserted-by":"publisher","award":["ID D2B8D520, CUP B53C22001750006"],"award-info":[{"award-number":["ID D2B8D520, CUP B53C22001750006"]}],"id":[{"id":"10.13039\/100031478","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,10,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Surface-enhanced coherent anti-Stokes Raman scattering (SECARS) has been widely explored for ultrasensitive vibrational spectroscopy, primarily in microscopy configurations employing high-numerical-aperture optics. Here, we demonstrate standoff detection of molecular vibrational fingerprints using plasmon-enhanced time-resolved SECARS at a working distance of 20 cm. We employ Ag-decorated silicon nanowires as a plasmonic substrate supporting the analyte molecules. Broadband pump (575 nm) and Stokes (625 nm) femtosecond pulses together with a narrowband delayed probe (515 nm) are used to generate the SECARS signal, with excitation and anti-Stokes wavelengths overlapping the plasmonic response of the substrate. System performance is first calibrated through Raman and CARS measurements of liquid pyridine and compressed Na2DPA powder. SECARS spectra of Rhodamine B and Na2DPA deposited on Ag-SiNWs are then recorded in backscattering at 20 cm distance, revealing clear vibrational fingerprints down to 10\u20137 M for Rhodamine B and 10\u20136 M for Na2DPA. The Na2DPA measurements provide an estimate of the overall SECARS\/Raman signal amplification, yielding an effective enhancement of the order of 1013 under the present experimental conditions. These results establish a proof-of-concept for plasmon-enhanced standoff vibrational spectroscopy from analyte-loaded nanostructured substrates, including dipicolinate targets relevant to bacterial-spore detection.<\/jats:p>","DOI":"10.1021\/acsphotonics.6c01317","type":"journal-article","created":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T04:28:51Z","timestamp":1790310531000},"page":"5674-5684","source":"Crossref","is-referenced-by-count":0,"title":["Standoff Time-Resolved\nSECARS on Ag-Decorated Silicon\nNanowires"],"prefix":"10.1021","volume":"13","author":[{"given":"Marco","family":"Polastri","sequence":"first","affiliation":[{"name":"Politecnico di Milano , , Piazza Leonardo da Vinci 32 , ,","place":["Milano, Italy, 20132"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7723-4356","authenticated-orcid":true,"given":"Antonio Alessio","family":"Leonardi","sequence":"additional","affiliation":[{"name":"University of Messina , , Viale F. S. d\u2019Alcontres 31 , ,","place":["Messina, Italy, I-98166"]},{"name":"Institute for Microelectronics and Microsystems (IMM-CNR) , Viale F. S. d\u2019Alcontres 31 , ,","place":["Messina, Italy, 98166"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ileana","family":"Ielo","sequence":"additional","affiliation":[{"name":"University of Messina , , Viale F. S. d\u2019Alcontres 31 , ,","place":["Messina, Italy, I-98166"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1947-1123","authenticated-orcid":true,"given":"Barbara","family":"Fazio","sequence":"additional","affiliation":[{"name":"Institute for Microelectronics and Microsystems (IMM-CNR) , Viale F. S. d\u2019Alcontres 31 , ,","place":["Messina, Italy, 98166"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9534-2702","authenticated-orcid":true,"given":"Giulio","family":"Cerullo","sequence":"additional","affiliation":[{"name":"Politecnico di Milano , , Piazza Leonardo da Vinci 32 , ,","place":["Milano, Italy, 20132"]},{"name":"Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche , Piazza Leonardo da Vinci 32 , ,","place":["Milano, Italy, 20133"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alessia","family":"Irrera","sequence":"additional","affiliation":[{"name":"Institute for Microelectronics and Microsystems (IMM-CNR) , Viale F. S. d\u2019Alcontres 31 , ,","place":["Messina, Italy, 98166"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9397-619X","authenticated-orcid":true,"given":"Nicola","family":"Coluccelli","sequence":"additional","affiliation":[{"name":"Politecnico di Milano , , Piazza Leonardo da Vinci 32 , ,","place":["Milano, Italy, 20132"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,24]]},"reference":[{"key":"2026100710083801800_cit1","doi-asserted-by":"publisher","first-page":"R597","DOI":"10.1088\/0953-8984\/14\/18\/202","article-title":"Surface-enhanced\nRaman scattering and biophysics","volume":"14","author":"Kneipp","year":"2002","journal-title":"J. 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Spectrosc"},{"key":"2026100710083801800_cit4","doi-asserted-by":"publisher","first-page":"12090","DOI":"10.1021\/acsnano.9b06486","article-title":"Tracking airborne\nmolecules from afar: Three-dimensional metal-organic framework-surface-enhanced\nraman scattering platform for stand-off and real-time atmospheric\nmonitoring","volume":"13","author":"Phan-Quang","year":"2019","journal-title":"ACS Nano"},{"key":"2026100710083801800_cit5","doi-asserted-by":"publisher","first-page":"507","DOI":"10.1146\/annurev.physchem.012809.103512","article-title":"Coherent Nonlinear\nOptical Imaging: Beyond Fluorescence Microscopy","volume":"62","author":"Min","year":"2011","journal-title":"Annu. Rev. Phys. Chem"},{"key":"2026100710083801800_cit6","doi-asserted-by":"publisher","first-page":"891","DOI":"10.1038\/srep00891","article-title":"Time-resolved surface-enhanced\ncoherent sensing of\nnanoscale molecular complexes","volume":"2","author":"Voronine","year":"2012","journal-title":"Sci. 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Rep"},{"key":"2026100710083801800_cit33","doi-asserted-by":"publisher","first-page":"044502","DOI":"10.1063\/1.2219439","article-title":"Development of simultaneous\nfrequency- And time-resolved coherent anti-Stokes Raman scattering\nfor ultrafast detection of molecular Raman spectra","volume":"125","author":"Prince","year":"2006","journal-title":"J. Chem. Phys"},{"key":"2026100710083801800_cit34","doi-asserted-by":"publisher","first-page":"265","DOI":"10.1126\/science.1139055","article-title":"Optimizing\nthe Laser-Pulse\nConfiguration for Coherent Raman Spectroscopy","volume":"316","author":"Pestov","year":"2007","journal-title":"Science"},{"key":"2026100710083801800_cit35","unstructured":"ChemicalBook.\n          \n          Pyridine(110-86-1) Raman. https:\/\/www.chemicalbook.com\/SpectrumEN_110-86-1_raman.htm.\n(Accessed 11 September, 2026)."},{"key":"2026100710083801800_cit36","doi-asserted-by":"publisher","first-page":"19334","DOI":"10.1073\/pnas.0908712106","article-title":"The physical state\nof water in bacterial spores","volume":"106","author":"Sunde","year":"2009","journal-title":"Proc. Natl. Acad.\nSci. U. S. 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(Accessed 11 September, 2026)."},{"key":"2026100710083801800_cit40","doi-asserted-by":"crossref","DOI":"10.5772\/31859","article-title":"Detection of\nBacillus Spores by Surface-Enhanced Raman Spectroscopy","volume-title":"Bioterrorism","author":"Farquharson","year":"2012"},{"key":"2026100710083801800_cit41","doi-asserted-by":"publisher","first-page":"375603","DOI":"10.1088\/0957-4484\/27\/37\/375603","article-title":"Decoration\nof silicon\nnanowires with silver nanoparticles for ultrasensitive surface enhanced\nRaman scattering","volume":"27","author":"D\u2019andrea","year":"2016","journal-title":"Nanotechnology"},{"key":"2026100710083801800_cit42","doi-asserted-by":"publisher","first-page":"3683","DOI":"10.1039\/c2an35468c","article-title":"Analysis\nof the Raman spectra of\nCa2+-dipicolinic acid alone and in the bacterial spore\ncore in both aqueous and dehydrated environments","volume":"137","author":"Kong","year":"2012","journal-title":"The Analyst"},{"key":"2026100710083801800_cit43","doi-asserted-by":"publisher","first-page":"063410","DOI":"10.1103\/PhysRevA.85.063410","article-title":"Origin of giant\ndifference between fluorescence, resonance,\nand nonresonance Raman scattering enhancement by surface plasmons","volume":"85","author":"Sun","year":"2012","journal-title":"Phys. Rev. A"},{"key":"2026100710083801800_cit44","doi-asserted-by":"publisher","first-page":"27096","DOI":"10.1021\/jp4105932","article-title":"Quantification of Resonance Raman\nEnhancement Factors for Rhodamine 6G (R6G) in Water and on Gold and\nSilver Nanoparticles: Implications for Single-Molecule R6G SERS","volume":"117","author":"Ameer","year":"2013","journal-title":"J. Phys. Chem. 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